Rice lasts a very long time. Tortillas last a long time in the fridge (you can probably freeze them?). Freeze the meat. Beans last forever. Sour cream and cheese last a long time in the fridge and you'll certainly use them for other things.
Guacamole/avocados/other veggies are potentially harder to deal with for long term storage, but that depends and it looks like there are some options. Salsa also keeps for many, many months.
As far as time goes, if you're single, many of the ingredients could be cooked in a batch and then frozen, even as whole burritos.